diff --git a/examples/config/phase/thermal/Al.yaml b/examples/config/phase/thermal/Al.yaml
index 1276f9a3f..b00dceebd 100644
--- a/examples/config/phase/thermal/Al.yaml
+++ b/examples/config/phase/thermal/Al.yaml
@@ -7,9 +7,11 @@ references:
 
 output: [T]
 
-K_11: 2.380e+2
-K_11,T: 2.068e-3
-K_11,T^2: -7.765e-5
+K_11: 2.374e+2
+K_11,T: 8.952e-3
+K_11,T^2: 2.650e-5
+K_11,T^3: -5.687e-7
+K_11,T^4: 6.407e-10
 
 T_ref: 293.15
 
diff --git a/examples/config/phase/thermal/Cu.yaml b/examples/config/phase/thermal/Cu.yaml
index 3875dc8ef..09bd6d664 100644
--- a/examples/config/phase/thermal/Cu.yaml
+++ b/examples/config/phase/thermal/Cu.yaml
@@ -2,14 +2,16 @@ references:
   - J.G. Hust and A.B. Lankford,
     Thermal Conductivity of Aluminum, Copper, Iron, and Tungsten from 1K to the Melting Point,
     US Department of Commerce, Boulder, Colorado, 1984,
-    fit to Tab. 2.4.1 (RRR=1000, T_min=200K, T_max=1000K)
+    fit to Tab. 2.4.1 (RRR=300, T_min=150K, T_max=1000K)
   - https://www.mit.edu/~6.777/matprops/copper.htm
 
 output: [T]
 
-K_11: 4.039e+2
-K_11,T: -8.119e-2
-K_11,T^2: 1.454e-5
+K_11: 4.005e+2
+K_11,T: -1.075e-1
+K_11,T^2: 3.293e-4
+K_11,T^3: -7.533e-7
+K_11,T^4: 5.223e-10
 
 T_ref: 293.15
 
diff --git a/examples/config/phase/thermal/Fe.yaml b/examples/config/phase/thermal/Fe.yaml
index b569683f0..74e586d32 100644
--- a/examples/config/phase/thermal/Fe.yaml
+++ b/examples/config/phase/thermal/Fe.yaml
@@ -2,14 +2,15 @@ references:
   - J.G. Hust and A.B. Lankford,
     Thermal Conductivity of Aluminum, Copper, Iron, and Tungsten from 1K to the Melting Point,
     US Department of Commerce, Boulder, Colorado, 1984,
-    fit to Tab. 4.4.1 (RRR=300, T_min=200K, T_max=1000K)
+    fit to Tab. 4.4.1 (RRR=300, T_min=150K, T_max=1000K)
   - https://www.engineeringtoolbox.com/specific-heat-metals-d_152.html
 
 output: [T]
 
-K_11: 8.055e+1
-K_11,T: -1.051e-1
-K_11,T^2: 5.464e-5
+K_11: 8.034e+1
+K_11,T: -1.216e-1
+K_11,T^2: 1.327e-4
+K_11,T^3: -7.993e-8
 
 T_ref: 293.15
 
diff --git a/examples/config/phase/thermal/Ni.yaml b/examples/config/phase/thermal/Ni.yaml
index 6544c197b..df501f30c 100644
--- a/examples/config/phase/thermal/Ni.yaml
+++ b/examples/config/phase/thermal/Ni.yaml
@@ -2,14 +2,16 @@ references:
   - Y.S. Touloukian et al.,
     TPRC Data Series Volume 1. Thermal conductivity - metallic elements and alloys,
     IFI/Plenum, 1970,
-    fit to Tab. 35R (T_min=150K, T_max=500K)
+    fit to Tab. 35R (T_min=80K, T_max=500K)
   - https://www.engineeringtoolbox.com/specific-heat-metals-d_152.html
 
 output: [T]
 
-K_11: 9.132e+1
-K_11,T: -1.525e-1
-K_11,T^2: 3.053e-4
+K_11: 9.311e+1
+K_11,T: -8.719e-2
+K_11,T^2: -3.793e-4
+K_11,T^3: -4.003e-6
+K_11,T^4: 2.676e-8
 
 T_ref: 293.15
 
diff --git a/examples/config/phase/thermal/Sn-beta.yaml b/examples/config/phase/thermal/Sn-beta.yaml
index 99f2c3cee..5f22f4ece 100644
--- a/examples/config/phase/thermal/Sn-beta.yaml
+++ b/examples/config/phase/thermal/Sn-beta.yaml
@@ -2,18 +2,22 @@ references:
   - Y.S. Touloukian et al.,
     TPRC Data Series Volume 1. Thermal conductivity - metallic elements and alloys,
     IFI/Plenum, 1970,
-    fit to Tab. 61R (T_min=100K, T_max=400K)
+    fit to Tab. 61R (T_min=80K, T_max=500K)
   - https://www.engineeringtoolbox.com/specific-heat-metals-d_152.html
 
 output: [T]
 
-K_11: 7.414e+1
-K_11,T: -6.465e-2
-K_11,T^2: 2.066e-4
+K_11: 7.495e+1
+K_11,T: -5.646e-2
+K_11,T^2: 1.420e-5
+K_11,T^3: -5.390e-7
+K_11,T^4: 4.012e-9
 
-K_33: 5.147e+1
-K_33,T: -4.506e-2
-K_33,T^2: 1.435e-4
+K_33: 5.204e+1
+K_33,T: -3.940e-2
+K_33,T^2: 7.037e-6
+K_33,T^3: -3.738e-7
+K_33,T^4: 2.873e-9
 
 T_ref: 293.15
 
diff --git a/examples/config/phase/thermal/W.yaml b/examples/config/phase/thermal/W.yaml
index 5a9cb475f..81326321c 100644
--- a/examples/config/phase/thermal/W.yaml
+++ b/examples/config/phase/thermal/W.yaml
@@ -2,14 +2,16 @@ references:
   - J.G. Hust and A.B. Lankford,
     Thermal Conductivity of Aluminum, Copper, Iron, and Tungsten from 1K to the Melting Point,
     US Department of Commerce, Boulder, Colorado, 1984,
-    fit to Tab. 5.4.1 (RRR=300, T_min=200K, T_max=1000K)
+    fit to Tab. 5.4.1 (RRR=300, T_min=100K, T_max=2000K)
   - https://www.mit.edu/~6.777/matprops/tungsten.htm
 
 output: [T]
 
-K_11: 1.758e+2
-K_11,T: -1.605e-1
-K_11,T^2: 1.160e-4
+K_11: 1.750e+2
+K_11,T: -1.809e-1
+K_11,T^2: 2.257e-4
+K_11,T^3: -1.395e-7
+K_11,T^4: 3.192e-11
 
 T_ref: 293.15